Super low-profile IRED focuses on mobile device eye tracking

Super low-profile IRED focuses on mobile device eye tracking

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By eeNews Europe

 www.osram.comThe high optical output of typically 1200 mW and broad emission characteristics make the IRED ideal for facial recognition and eye-tracking systems which can activate applications in response to blinking instead of the usual double-click.

The basis for the record emitter is the Synios package which Osram introduced some time ago for LEDs in the visible spectral range for automotive applications. The package is compact, measuring 2.7 mm x 2.0 mm x 0.6 mm, and offers optimum light extraction. The SFH 4770S is the first component in which this package has been used for infrared emitters. Installed in the IRED is a 1 mm2 emitter chip with a wavelength of 850 nm in which two emission centers are provided with the aid of nanostack technology. Overall, the component delivers a typical optical output of 1200 mW at a current of 1 ampere with only one chip

With a height of 0.6 mm, the SFH 4770S has a lower profile than all IREDs previously available in its output class. The device is attractive for designs that call for broad homogeneous illumination in a limited space. This is particularly the case for applications in mobile devices such as smartphones and tablets.

The SFH 4770S takes up very little space.  Compared to the company’s Oslon technology, which was previously the company’s most compact high-power IRED, the Synios footprint has been reduced by almost one third and the height by around one quarter.

The emission angle of 120° ensures that the target area is evenly illuminated. Even with this emission characteristic, the SFH 4770S achieves a typical radiant intensity of 375 mW per steradiant (mW/sr) at 1 A thanks to its high overall output.

The Synios package is also suitable for injecting light into external optics or light guides. Another important property for all applications is the excellent thermal stability of the SFH 4770S. Its thermal resistance (Rth) is a maximum of 9 kelvin per watt.

The Synios SFH 4770S is already available on request for first customer projects. Volume start-up is planned for the end of January 2016.

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